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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 31°F | 22°F | 0.3" |
| February | 17°F | 36°F | 25°F | 0.3" |
| March | 24°F | 47°F | 34°F | 0.5" |
| April | 29°F | 55°F | 41°F | 0.9" |
| May | 37°F | 65°F | 50°F | 1.4" |
| June | 47°F | 79°F | 62°F | 0.5" |
| July | 55°F | 87°F | 71°F | 0.7" |
| August | 52°F | 83°F | 67°F | 0.7" |
| September | 44°F | 74°F | 58°F | 0.8" |
| October | 33°F | 59°F | 45°F | 0.7" |
| November | 23°F | 45°F | 33°F | 0.3" |
| December | 13°F | 31°F | 22°F | 0.2" |
| Index | Rock Springs | Wyoming | National |
| Air quality index | 46 | 39 | 42 |
| Pollution index | 5,619,220 | 1,779,975 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 262 |
| Days with moderate air quality | 100 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.460% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.120% |
| Mercury | 0.270% |
| City | Population | Air Quality Index | National Avg. |
| Arrowhead Springs, WY | 121 | 46 | 8.0% |
| North Rock Springs, WY | 2,727 | 46 | 8.0% |
| Clearview Acres, WY | 994 | 46 | 8.0% |
| Reliance, WY | 253 | 46 | 8.0% |
| Green River, WY | 12,025 | 46 | 8.0% |
| Rock Springs, WY | 23,238 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Roseburg, OR | 23,237 | 24 | 52.0% |
| Cottage Lake, WA | 23,239 | 45 | 10.0% |
| Avon, OH | 23,233 | 50 | = 100 |
| Greenbelt, MD | 23,253 | 47 | 6.0% |
| East Hants, NS | 23,212 | n/a | |
| Rock Springs, WY | 23,238 | 46 | 8.0% |
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